Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1984-05-30
1986-04-08
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 585R, 324 585C, 73159, G01R 2704
Patent
active
045815755
ABSTRACT:
A method and apparatus for measuring the orientation of the constituents of sheets are disclosed. The method comprises the steps of inserting a sheet into a small clearance with which the openings in a pair of waveguides are opposed to each other to form a cavity resonator, producing a relative motion at a constant speed between the sheet and the resonator while emitting linearly polarized microwaves from the upper waveguide to allow them to fall on the sheet at right angles thereto, measuring the amount of attenuation of the microwaves by the lower waveguide, and determining the orientation of the constituent of the sheet from that angle of the sheet with respect to the plane of polarization of the microwaves which gives the maximum attenuation.
REFERENCES:
patent: 3532973 (1970-10-01), Feinstein
patent: 4087746 (1978-05-01), Kanae
patent: 4211970 (1980-07-01), Fitzky
patent: 4297874 (1981-11-01), Sasaki
patent: 4344030 (1982-08-01), Anderson
patent: 4500835 (1985-02-01), Heikkila
Tiuri: "Microwave Method for Measurement of Fiber Orientation in Paper"--4th European MW Conference--Sep. 1974--pp. 137-140.
Fiber Orientation and Squareness of Paper (Zero-Span Tensile Strength), TAPPI Standard T 481 sm-60, suggested method--1952, revised--1960.
Fujii Yoshihiko
Osaki Shigeyoshi
Saiwai Kazuhiko
Tomita Osamu
Eisenzopf Reinhard J.
Kanzaki Paper Manufacturing Co. Ltd.
Solis Jose M.
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